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A related question is why do we still have SQL databases when everybody could be using Datalog? https://en.wikipedia.org/wiki/Datalog https://en.wikipedia.org/

• jplane 7y ago
  Take a look at datomic, it uses datalog.
  • galaxyLogic 7y ago
    Seems awesome from the outset. I especially like "Datomic stores all history, and lets you query against any point in time."
• tom_mellior 7y ago
  Some guesses, I have no skin in this game: - historical inertia, i.e., SQL being better known, being taught to a lot more people, already used everywhere; even if every new project started Datalog, we would "still have SQL databases" for many decades, see the recent publicity for Cobol - aggregate functions, sorting of results - syntax: "select foo, bar from table_with_many_many_columns" is easier to get right than "table_with_many_many_columns(_, _, _, _, Bar, _, _, _, _, Foo, _, _, _)" (though in most other aspects Datalog syntax is indeed superior)